<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
    <meta name="description" content="Add HTML overlay using canvas coordinates.">
    <meta name="cesium-sandcastle-labels" content="Tutorials">
    <title>Cesium Demo</title>
    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script type="text/javascript" src="../../../Build/CesiumUnminified/Cesium.js" nomodule></script>
    <script type="module" src="../load-cesium-es6.js"></script>
</head>
<body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html">
<style>
    @import url(../templates/bucket.css);
</style>
<div id="cesiumContainer" class="fullSize"></div>
<div id="loadingOverlay"><h1>Loading...</h1></div>
<div id="toolbar"></div>
<img id="htmlOverlay" style="position: absolute" src="../images/Cesium_Logo_overlay.png">
<script id="cesium_sandcastle_script">
function startup(Cesium) {
    'use strict';
//Sandcastle_Begin
var viewer = new Cesium.Viewer('cesiumContainer');

// To geographically place an HTML element on top of the Cesium canvas, we use
// scene.cartesianToCanvasCoordinates to map a world position to canvas x and y values.
// This example places and img element, but any element will work.

var htmlOverlay = document.getElementById('htmlOverlay');
var scratch = new Cesium.Cartesian2();
viewer.scene.preRender.addEventListener(function() {
    var position = Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883);
    var canvasPosition = viewer.scene.cartesianToCanvasCoordinates(position, scratch);
    if (Cesium.defined(canvasPosition)) {
        htmlOverlay.style.top = canvasPosition.y + 'px';
        htmlOverlay.style.left = canvasPosition.x + 'px';
    }
});
//Sandcastle_End
    Sandcastle.finishedLoading();
}
if (typeof Cesium !== 'undefined') {
    window.startupCalled = true;
    startup(Cesium);
}
</script>
</body>
</html>
